Why when i have low pressure , the computer doesn't tell me which tire it is, but just tells me a tire is low? got a base e92 328

i believe you need a software update...
i used to have just low tire icon yellow or red (!) and nothing else, and it meant that i would have to check all four tires before finding the one that is low. But after software update that i received due to warranty work, now car shows exactly which tire is low...